"Too often, environmentalists slip half-knowingly between human health and environmental health...Unfortunately, there's no natural law saying that planet health and human health are unitary. Consider the potato... It takes 466 kilocalories of energy to produce a pound of potatoes, according to research by David Pimentel of Cornell University... Other health foods like Brussels sprouts and snap beans also take significantly more fossil fuel energy to produce than the maligned potato. A heaping bowl of steamed greens might be good for you, but the planet would prefer that you ate a plateful of microwaved potatoes..."